{
  "CN": "system:kube-controller-manager",
  "key": {
      "algo": "rsa",
      "size": 2048
  },
  "hosts": [
    "127.0.0.1",
    "{{master_ip1}}",
    "{{master_ip2}}",
    "{{master_ip3}}"
  ],
  "names": [
    {
      "C": "CN",
      "ST": "ShangHai",
      "L": "ShangHai",
      "O": "system:kube-controller-manager",
      "OU": "System"
    }
  ]
}